Best Burrito, San Francisco

Sunset Magazine recently had a 'vote-off' and crowned Papalote's carne asada burrito 'best in the West.' The whole West aside, I don't think I know too many people who would name it best burrito in the Mission. But which one is really deserving? Let's do our own vote-off. Where's your favorite San Francisco burrito? (Feel free to break down by filling.)